...predominantly white team of top advisers and the mostly black tier of aides below them...

...white advisers encouraged him to withdraw an invitation to his pastor, whose Afro-centric sermons have been construed as anti-white, to deliver the invocation at the official campaign kickoff...

...when his candidacy was met by a wave of African-American suspicion, the senator's black aides pulled in prominent black scholars, business leaders and elected officials as advisers...

...he stayed away from a civil rights demonstration and rarely visited black churches when he was struggling to win over white voters in Iowa...

http://www.iht.com/articles/2008/02/11/america/obama.php